Over Three Decades of Data Envelopment Analysis Applied to the Measurement of Efficiency in Higher Education: A Bibliometric Analysis - Pham Van, Thuan; Tran, Trung; Trinh Thi Phuong, Thao; Hoang Ngoc, Anh; Nghiem Thi, Thanh; La Phuong, Thuy (Journal on Efficiency and Responsibility in Education and Science, 2022)